Combustion tube assembly of a water heater

A heat exchanger assembly of a water heater, the heat exchanger assembly comprising:

• a combustion tube having an open end, a closed end, and an outflow opening located between the open end and the closed end, wherein a cavity of the combustion tube provides a chamber for a combustion of a water heater fuel that produces an exhaust gas that flows down toward the closed end;
• a diverter structure positioned inside the combustion tube and including a first section having a first leg and a second leg affixed to the closed end, the first leg and the second leg forming a flow opening, the diverter structure configured to divert the exhaust gas such that the exhaust gas flows toward the closed end on a first side of the diverter structure and such that the exhaust gas flows from the first side of the diverter structure to a second side of the diverter structure through the flow opening proximal to the closed end;
• and
• a hollow coil attached to the combustion tube, wherein the outflow opening provides an outlet for the exhaust gas that flows to the second side of the diverter structure to exit the combustion tube into the hollow coil.

A water heater, comprising:

• a water tank;
• a combustion system positioned at a top end of the water heater;
• and
• a heat exchanger assembly positioned inside the water tank, the heat exchanger assembly comprising:
• a combustion tube having an open end, a closed end, and an outflow opening located between the open end and the closed end, wherein a cavity of the combustion tube provides a chamber for a combustion of a water heater fuel that produces an exhaust gas that flows down toward the closed end;
• and
• a diverter structure positioned inside the combustion tube and including a first section having one or more legs affixed to the closed end to form a flow opening and a wide section, the first section and the wide section defining a funnel shape, the diverter structure configured to divert the exhaust gas such that the exhaust gas flows toward the closed end on a first side of the diverter structure, the first side being through the first section, and such that the exhaust gas flows from the first side of the diverter structure to a second side of the diverter structure through the flow opening proximal to the closed end, the second side being an annular space between the first section and a portion of the combustion tube;
• and
• a hollow coil attached to the combustion tube, wherein the outflow opening provides an outlet for the exhaust gas that flows to the second side of the diverter structure to exit the combustion tube into the hollow coil.